But the "killer" combination could leave those with asthma vulnerable to a potentially fatal attack.

Medics from Asthma UK warn that high levels of pollen in the air can "inflame" the airways and spark life-threatening symptoms for sufferers.

It comes at the start of the grass pollen season, which will peak over the next two weeks in England and Wales.

Killer combo

Dr Andy Whittamore, GP and Clinical Lead at Asthma UK, said: “The deadly combination of hot weather, widespread thunderstorms and rising levels of grass pollen this weekend could put more than 3 million people with asthma at risk of a potentially fatal asthma attack.

"When pollen is in the air it can inflame people’s airways, triggering asthma symptoms.

"Stormy weather can make it worse as it breaks the pollen into much smaller particles, which are then inhaled more deeply into the lungs.

“If you have asthma and are already noticing more symptoms because of hay fever, such as coughing, a tight chest or breathlessness, make sure you keep your blue reliever inhaler with you at all times."

'TOXIC COCKTAIL'

KNOW THE SIGNS

POLLEN BOMB

Hay fever hell as pollen explosion could be deadly for asthma sufferers

Temperatures then are expected to reach 27C in central regions and the south east.

But the weekend of hot sunshine will only last until Monday when the mercury takes a nosedive again, the Met Office has said.

Pollen levels are also set to tail off again for much of the UK from the beginning of next week.

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This chart shows the different types of pollen and when they peak throughout the year

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Pollen levels will rise across England and Wales tomorrow lowering in places over the weekend

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